Drupal 9 compatibility

Attached patch does not apply against latest version. Below is the updated list of issues against the latest version

62/62 [============================] 100%

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Line box.install
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59 Call to deprecated method applyUpdates() of class Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface:
in drupal:8.7.0 and is removed from drupal:9.0.0. Use
\Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface::getChangeList()
and execute each entity type and field storage update manually instead.
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Line modules\box_clone\box_clone.module
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56 Call to deprecated function format_string():
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal\Component\Render\FormattableMarkup instead.
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Line modules\box_clone\src\Form\BoxCloneForm.php
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39 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
50 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
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Line modules\graphql_box\src\Plugin\GraphQL\Fields\BoxByMachineName.php
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Class Drupal\graphql_core\GraphQL\FieldPluginBase not found and could not be autoloaded.
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Line modules\graphql_box\src\Plugin\GraphQL\Fields\BoxMachineName.php
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Class Drupal\graphql_core\GraphQL\FieldPluginBase not found and could not be autoloaded.
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Line src\BoxListBuilder.php
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18 Usage of deprecated trait Drupal\Core\Routing\LinkGeneratorTrait in class Drupal\box\BoxListBuilder:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Link instead.
41 Call to deprecated method l() of class Drupal\box\BoxListBuilder:
in drupal:8.0.0 and is removed from drupal:9.0.0. Use
\Drupal\Core\Link::fromTextAndUrl() instead.
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Line src\BoxPermissions.php
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15 Usage of deprecated trait Drupal\Core\Routing\UrlGeneratorTrait in class Drupal\box\BoxPermissions:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Url instead.
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Line src\Controller\BoxController.php
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30 Call to deprecated method entityManager() of class Drupal\Core\Controller\ControllerBase:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Most of the time static::entityTypeManager() is supposed to be used
instead.
31 Call to deprecated method entityManager() of class Drupal\Core\Controller\ControllerBase:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Most of the time static::entityTypeManager() is supposed to be used
instead.
46 Call to deprecated method entityManager() of class Drupal\Core\Controller\ControllerBase:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Most of the time static::entityTypeManager() is supposed to be used
instead.
47 Call to deprecated function format_date():
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal::service('date.formatter')->format().
65 Call to deprecated method entityManager() of class Drupal\Core\Controller\ControllerBase:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Most of the time static::entityTypeManager() is supposed to be used
instead.
93 Call to deprecated method l() of class Drupal\Core\Controller\ControllerBase:
in drupal:8.0.0 and is removed from drupal:9.0.0. Use
\Drupal\Core\Link::fromTextAndUrl() instead.
96 Call to deprecated method link() of class Drupal\Core\Entity\EntityInterface:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\EntityInterface::toLink()->toString() instead.
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Line src\Form\BoxDeleteMultipleForm.php
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192 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
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Line src\Form\BoxForm.php
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108 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use \Drupal::time()->getRequestTime();
125 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
130 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
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Line src\Form\BoxRevisionDeleteForm.php
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76 Call to deprecated function format_date():
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal::service('date.formatter')->format().
110 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
110 Call to deprecated function format_date():
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal::service('date.formatter')->format().
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Line src\Form\BoxRevisionRevertForm.php
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123 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
144 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use \Drupal::time()->getRequestTime();
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Line src\Form\BoxRevisionRevertTranslationForm.php
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113 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use \Drupal::time()->getRequestTime();
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Line src\Form\BoxTypeForm.php
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144 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
150 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
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Line src\Plugin\Block\BoxView.php
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110 Call to deprecated function drupal_set_message():
in drupal:8.5.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
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Line src\Plugin\views\field\BoxBulkForm.php
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12 Class Drupal\box\Plugin\views\field\BoxBulkForm extends deprecated class Drupal\system\Plugin\views\field\BulkForm:
in drupal:8.5.0 and is removed from drupal:9.0.0. Use
\Drupal\views\Plugin\views\field\BulkForm instead.
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Line src\Plugin\views\field\RevisionLink.php
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27 Call to deprecated method urlInfo() of class Drupal\Core\Entity\EntityInterface:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Entity\EntityInterface::toUrl() instead.
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Line src\Plugin\views\wizard\Box.php
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220 Call to deprecated function entity_get_form_display():
in drupal:8.8.0 and is removed from drupal:9.0.0. Use
EntityDisplayRepositoryInterface::getFormDisplay() instead.
221 Call to deprecated method entityManager() of class Drupal:
in drupal:8.0.0 and is removed from drupal:9.0.0.
Use \Drupal::entityTypeManager() instead in most cases. If the needed
method is not on \Drupal\Core\Entity\EntityTypeManagerInterface, see the
deprecated \Drupal\Core\Entity\EntityManager to find the
correct interface or service.
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Line tests\src\Functional\BoxPlacementTest.php
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Class PHPUnit\Framework\TestCase not found and could not be autoloaded.
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Line tests\src\Functional\EntityTest.php
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Class PHPUnit\Framework\TestCase not found and could not be autoloaded.
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Line tests\src\Functional\LoadTest.php
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Class PHPUnit\Framework\TestCase not found and could not be autoloaded.
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Line tests\src\Functional\TypeTest.php
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Class PHPUnit\Framework\TestCase not found and could not be autoloaded.
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Line tests\src\Kernel\BoxValidationTest.php
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Class PHPUnit\Framework\TestCase not found and could not be autoloaded.
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[ERROR] Found 38 errors

Kindly review patch.
For error like this - "Class PHPUnit\Framework\TestCase not found and could not be autoloaded.", need to create composer.json.
Will update in next issue.

The patch is for a wrong branch.

Please review